package com.hgy.common.utils;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 属性文件工具类
 * 
 * @author alone
 *
 */
public final class PropsUtil {
	
	private static final Logger LOOGER = LoggerFactory.getLogger(PropsUtil.class);
	
	/**
	 * 加载属性文件
	 * 
	 * @param fileName
	 * @return
	 */
	public static Properties LoadProps(String fileName){
		Properties props = null;
		InputStream is = null;
		
		// ContextClassLoader.getResourceAsStream --> is
		try {
			is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
			if(is == null){
				throw new FileNotFoundException( fileName + " file is not found");
			}
			props = new Properties();
			props.load(is);
		} catch (Exception e) {
			e.printStackTrace();
			LOOGER.error("load properties file failure" + e);
		}finally{
			if (is != null){
				try {
					is.close();
				} catch (IOException e) {
					e.printStackTrace();
					LOOGER.error("close input stream failure" + e); 
				}
			}
		}
		return props;
	}
	
	/**
	 * 获取字符型属性（默认值为空字符串）
	 * 
	 * @param props
	 * @param key
	 * @return
	 */
	public static String getString(Properties props, String key){
		return getString(props, key, "");
	}
	
	/**
	 * 获取字符型属性（可指定默认值）
	 * 
	 * @param props
	 * @param key
	 * @param defaultvalue
	 * @return
	 */
	public static String getString(Properties props, String key, String defaultvalue){
		String value = defaultvalue;
		
		if(props.containsKey(key)){
			value = props.getProperty(key);
		}
		return value;
	}
	
	/**
	 * 获取数值型属性（默认值为0）
	 * 
	 * @param props
	 * @param key
	 * @return
	 */
	public static int getInt(Properties props, String key){
		return getInt(props, key, 0);
	}
	
	/**
	 * 获取数值型属性（可指定默认值）
	 * 
	 * @param props
	 * @param key
	 * @param defaultvalue
	 * @return
	 */
	public static int getInt(Properties props, String key, int defaultvalue){
		int value = defaultvalue;
		
		if(props.containsKey(key)){
			value = CastUtil.castInt(props.get(key));
		}
		return value;
	}
	
	/**
	 * 获取布尔型数值（默认值为false）
	 * 
	 * @param props
	 * @param key
	 * @return
	 */
	public static boolean getBoolean(Properties props, String key){
		return getBoolean(props, key, false);
	}
	
	/**
	 * 获取布尔型数值（可指定默认值）
	 * 
	 * @param props
	 * @param key
	 * @param defaultvalue
	 * @return
	 */
	public static boolean getBoolean(Properties props, String key, boolean defaultvalue){
		boolean value = defaultvalue;
		
		if(props.containsKey(key)){
			value = CastUtil.castBoolean(props.get(key));
		}
		return value;
	}
	
	
	
}
